Review
Chemistry, Physical
Xinya Liu, Jean-Luc Pozzo, Abdallah Hamze, Mouad Alami, Olivier Provot
Summary: This article reviews the significance of water addition on unsymmetrical internal alkynes in organic chemistry and presents a range of highly regioselective methods for different types of internal alkynes. It discusses hydration reactions of electron-rich and -poor diarylalkynes, arylalkylalkynes, and internal alkynes directed by carbonyl groups. The article also examines hydration reactions involving alkynes linked to CF3, esters, ketones, and heteroatoms. Mechanistic hypotheses explaining the regioselectivity in hydration reactions are discussed.
Article
Chemistry, Inorganic & Nuclear
Sourav Kar, Ketaki Kar, Subhash Bairagi, Moulika Bhattacharyya, Monojit Ghosal Chowdhury, Sundargopal Ghosh
Summary: Two electron precise early transition metal borate complexes were successfully synthesized by reacting with chalcogen-based borate ligands, showing unique coordination and structures. Characterization and DFT calculations provided insights into the bonding and electronic structures of these bimetallic borate species.
INORGANICA CHIMICA ACTA
(2022)
Article
Chemistry, Physical
Sagar Arepally, Ponnusamy Nandhakumar, Gisela A. Gonzalez-Montiel, Alina Dzhaparova, Gyeongho Kim, Ahyeon Ma, Ki Min Nam, Haesik Yang, Paul Ha-Yeon Cheong, Jin Kyoon Park
Summary: Electrochemical access to organometallic redox reagents allows for selective synthesis of various benzene derivatives with different regioisomers. A unified electrochemical strategy is presented for the selective cyclotrimerization of terminal alkynes to access both 1,3,5- and 1,2,4-regioisomeric trisubstituted benzene derivatives. The regiocontrol can be switched by the addition of a carboxylic acid.
Article
Chemistry, Multidisciplinary
Rita N. Kadikova, Ilfir R. Ramazanov, Azat M. Gabdullin, Oleg S. Mozgovoj, Usein M. Dzhemilev
Summary: This study compares the catalytic effects of NbCl5 and Cp2ZrCl2 on the reaction pathway of N,N-disubstituted 2-alkynylamines with Et2Zn, revealing the differences in the formation of (2Z)-alkenylamines and their dideuterated and diiodinated derivatives.
Article
Chemistry, Physical
Lilia S. S. Xie, Oscar Gonzalez, Kejun Li, Matteo Michiardi, Sergey Gorovikov, Sae Hee Ryu, Shannon S. Fender, Marta Zonno, Na Hyun Jo, Sergey Zhdanovich, Chris Jozwiak, Aaron Bostwick, Samra Husremovic, Matthew P. Erodici, Cameron Mollazadeh, Andrea Damascelli, Eli Rotenberg, Yuan Ping, D. Kwabena Bediako
Summary: Magnetic materials with noncollinear spin textures have potential for spintronic applications. Control over the length and energy scales of these spin textures is crucial for practical devices. The chiral helimagnets Cr1/3NbS2 and Cr1/3TaS2 exhibit similar magnetic phase diagrams but with different real-space periodicities, making them ideal for studying the underlying mechanisms of exotic spin textures. We conducted a comprehensive set of electronic structure studies on both Cr1/3NbS2 and Cr1/3TaS2 using angle-resolved photoemission spectroscopy and density functional theory. Our results reveal that the bands in Cr1/3TaS2 are more dispersive compared to Cr1/3NbS2, leading to different Fermi wavevectors. Despite these differences, the qualitative magnetic phase diagrams remain identical, indicating that hybridization between the intercalant and host lattice mediates the magnetic exchange interactions in both materials. We also found that ferromagnetic coupling is stronger in Cr1/3TaS2, but the heavier host lattice results in larger spin-orbit coupling and a stronger Dzyaloshinskii-Moriya interaction, leading to shorter spin textures.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hongyu Guo, Sheng Zhang, Yang Li, Xiaoqiang Yu, Xiujuan Feng, Yoshinori Yamamoto, Ming Bao
Summary: A palladium-catalyzed tail-to-tail reductive dimerization reaction of terminal alkynes is reported for the first time, leading to the efficient transformation of aromatic and aliphatic alkynes into 2,3-dibranched butadienes. The control of reaction solution acidity, achieved by a combination of pivalic acid and para-toluenesulfonic acid, is crucial for the selective tail-to-tail reductive dimerization reaction, which is proposed to proceed via a cationic alkenyl palladium intermediate under acidic conditions.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Shiwei Pan, Fan Chen, Yanyan Zhang, Liang Shao, Lingling Chu
Summary: A Markovnikov-selective hydrodifluoromethylation of alkynes with BrCF2H via nickel catalysis is reported. This method involves migratory insertion of nickel hydride to alkyne followed by CF2H-coupling, giving access to various branched CF2H-alkenes with high efficiency and exclusive regioselectivity. The mild conditions used are compatible with a wide range of aliphatic and aryl alkynes, making it a versatile and promising approach. Mechanistic studies have been conducted to support the proposed reaction pathway.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Polymer Science
Sentaro Okamoto, Takeshi Yamada, Takaya Uchida, Nana Kikuta, Yu-ya Kimura
Summary: This article discusses the application of a low-valent titanium reagent in the McMurry coupling polymerization and [2+2+2] cycloaddition polymerization of aryl dialdehyde and aromatic diyne monomers. Additionally, a low-valent titanium mediated dual-mode coupling copolymerization of aryl dialdehyde and alkynylaldehyde monomers via concurrent McMurry olefination and alkyne cyclotrimerization reactions is proposed.
Article
Materials Science, Ceramics
Arseniy Bokov, Anna Shelyug, Alexey Kurlov
Summary: The study demonstrates successful sintering of TaC and NbC ceramics with high densities, showcasing hardness of 20-25 GPa through reduction in carbon stoichiometry and submicron grain sizes. XRD, SEM, and TGA-DSC were employed to investigate the phenomena during processing, revealing the presence of oxygen impurities in carbide particles and decarburization and oxide segregation during sintering. The effects of decarburization and oxide segregation can be counteracted by carbon excess, but controlling the densification curve can be challenging in such cases.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
James Braun, Cedric Sauder, Christine Gueneau, Fiqiri Hodaj, Fanny Balbaud-Celerier
Summary: This study evaluates the chemical compatibility of niobium and tantalum with SiC at high temperatures using diffusion couple experiments. The results show that niobium and tantalum are chemically compatible with SiC, making them suitable liner materials for hybrid CMC/metal cladding materials.
Article
Chemistry, Applied
Alexander A. A. Fadeev, Gabriele Manca, Martin Kotora
Summary: A synthesis of 1,4-diborylated benzenes from alkynes and ethynyl boronate was achieved using Ru-catalyzed regioselective co-cyclotrimerization. The reaction showed good applicability to alkynes with metal-coordinating groups, giving useful diborylated benzenes in modest yields. DFT calculations provided insights into the reaction mechanism and the reason for its remarkable regioselectivity. Selected diborylated benzenes were further transformed into various products, including natural bioactive small molecules like quinones and hydroquinones.
ADVANCED SYNTHESIS & CATALYSIS
(2023)
Article
Chemistry, Physical
Ivana Zrinski, Alexey Minenkov, Cezarina Cela Mardare, Achim Walter Hassel, Andrei Ionut Mardare
Summary: Composite memristors based on anodic oxidation of Hf superimposed on Ta thin films were studied, showing promising memristive properties in the Hf/Ta thickness ratio between 4 and 5. The study on the structure and working principle of the composite oxide memristors provides insights for their application and optimization.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Kazuhisa Sato, Toshiya Matsushita
Summary: Structural defects in (Ta1-xTix)Se-2 compounds with anisotropic electrical conductivity were studied by observing cross-sectional images. Intercalants were found in the widest space between Se atoms, independent of Ti content or thermal history. The presence of Ti stabilized the 1T structure, reducing stacking faults. Chemical composition was found to dominate the structural defects in these compounds.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Tatsuto Hatanaka, Takuya Nomoto, Ryotaro Arita
Summary: Transition metal dichalcogenides (TMDs) exhibit various magnetic structures through intercalation of other transition metal atoms. To understand the chemical trend of the magnetic properties, we conducted a first-principles study on 48 compounds with different hosts, guests, and composition ratios. By applying spin density functional theory and the local force method, we derived classical spin models that are consistent with experimental results and explained the chemical trend in terms of 3d orbital occupancy. These findings can guide the prediction of magnetic structures in yet-to-be-synthesized compounds.
Article
Chemistry, Physical
Guoqi Zhang, Haisu Zeng, Shengping Zheng, Michelle C. Neary, Pavel A. Dub
Summary: Molecular complexes of vanadium were found to catalyze the anti-Markovnikov hydroboration reaction of alkynes, generating vinyl boronate esters with high turnover numbers and tolerance towards various functional groups. Preliminary computational analysis of the catalytic cycle revealed complex reactivity and activity of the redox-active ligand.
Article
Chemistry, Inorganic & Nuclear
Toshiyuki Takayanagi, Kohei Saito, Haruya Suzuki, Yuya Watabe, Takashi Fujiharae
Article
Chemistry, Multidisciplinary
Kohei Saito, Yuya Watabe, Takashi Fujihara, Toshiyuki Takayanagi, Jun-ya Hasegawa
JOURNAL OF COMPUTATIONAL CHEMISTRY
(2020)
Article
Chemistry, Organic
Yota Suzuki, Daisuke Kusuyama, Tomoaki Sugaya, Satoshi Iwatsuki, Masahiko Inamo, Hideo D. Takagi, Koji Ishihara
JOURNAL OF ORGANIC CHEMISTRY
(2020)
Article
Chemistry, Organic
Yota Suzuki, Ayumi Ikeda, Keiji Ohno, Takashi Fujihara, Tomoaki Sugaya, Koji Ishihara
JOURNAL OF ORGANIC CHEMISTRY
(2020)
Article
Chemistry, Applied
Keiji Ohno, Fuka Narita, Hidehisa Yokobori, Nanami Iiduka, Tomoaki Sugaya, Akira Nagasawa, Takashi Fujihara
Summary: The luminescence properties of novel boron difluoride complexes with flavonolates were investigated, showing that electronic and steric factors of the substituents influence emission intensity and maximum wavelength. The findings suggest that a twisted π-system can cause quenching of emission.
Article
Chemistry, Inorganic & Nuclear
Keiji Ohno, Kazuki Shiraishi, Tomoaki Sugaya, Akira Nagasawa, Takashi Fujihara
Summary: The synthesis, isomerization, and photophysical properties of a series of novel cis-N,N-cyclometalated complexes [Pt(C^N)(L-Phe)] were reported. The isomerization process from cis to trans forms did not significantly affect the absorption and luminescence properties in solution, except for a characteristic absorption peak observed for cis complexes. Interestingly, the cis complexes showed different absorption and emission colors in a crystalline phase compared to the trans isomers in an amorphous phase, indicating potential applications in optoelectronic devices.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Tatsuhiro Murakami, Naoki Matsumoto, Toshiyuki Takayanagi, Takashi Fujihara
Summary: The reaction mechanism of [2 + 2 + 2] cyclotrimerization of acetylenes catalyzed by transition metal compounds involves the formation of a metallacyclopentadiene intermediate through the coupling of two acetylenes followed by a [4 + 2] cycloaddition. Quantum chemical calculations demonstrate that Fe + -L-type compounds can catalyze acetylene cyclotrimerization through a concerted single-step mechanism. Trajectory calculations confirm the efficient formation of benzene through this mechanism, although some trajectories lead to the formation of intermediates instead of benzene. The research highlights the role of nuclear dynamics and ligand molecules in determining the reaction mechanism.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Keiji Ohno, Masaya Komuro, Tomoaki Sugaya, Akira Nagasawa, Takashi Fujihara
DALTON TRANSACTIONS
(2020)
Article
Chemistry, Inorganic & Nuclear
Kie Yamada, Hirotoshi Mori, Tomoaki Sugaya, Makoto Tadokoro, Junichi Maeba, Koichi Nozaki, Masa-aki Haga
DALTON TRANSACTIONS
(2019)
Article
Chemistry, Organic
Kyosuke Isoda, Mitsuru Matsuzaka, Tomoaki Sugaya, Takeshi Yasuda, Makoto Tadokoro
ORGANIC & BIOMOLECULAR CHEMISTRY
(2019)
Article
Chemistry, Inorganic & Nuclear
Keiji Ohno, Tetuya Sakata, Machi Shiiba, Akira Nagasawa, Takashi Fujihara
DALTON TRANSACTIONS
(2019)
Article
Chemistry, Inorganic & Nuclear
Makoto Tadokoro, Kazuo Isogai, Shohei Harada, Takaya Kouchi, Takeshi Yamane, Tomoaki Sugaya, Hajime Kamebuchi
DALTON TRANSACTIONS
(2019)
Article
Chemistry, Inorganic & Nuclear
Guojun Hu, Ziyue Deng, Yanwei Wang, Dan Yuan, Yong Zhang, Yingming Yao
Summary: A series of rare-earth metal complexes were synthesized and used as efficient initiators for the polymerization of trimethylene carbonate (TMC) and (L)-lactide ((L)-LA).
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Van Ha Nguyen, John H. K. Yip
Summary: In this study, eight PtII-azulene complexes were synthesized to investigate the effect of metalation on the electronic structures, spectroscopy, and luminescence of organic chromophores. The results showed that the attachment of Pt substituents to azulene affected the HOMOs, LUMOs, and luminescence properties. The study provides insights into the role of metalation in modifying the properties of organic chromophores.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Moon Kedia, Virender Singh, Bhaskaran Shankar, Malaichamy Sathiyendiran
Summary: This study synthesized two types of neutral binuclear metallocycles using a one-pot solvothermal method and characterized their structures. The analysis revealed that these complexes adopt a binuclear heteroleptic cyclic architecture and belong to phosphine oxide donor (P=O)-based supramolecular coordination cyclic complexes.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Radhey S. Srivastava
Summary: This study demonstrates the effectiveness of zero-valent elements as reductants for the deoxydehydration reaction of polyols catalyzed by ONO-pincer ligated molybdenum dioxo. The insolubility and easy separability of the reductants and their oxidized products during the reaction are emphasized. Additionally, the choice of ligand has an impact on the catalytic performance of the reaction.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Hao Zhou, Yajun Sun, Li Deng, Weiran Yang, Yuehui Li
Summary: Efficient Ru-catalyzed hydrogenation of aldehydes was achieved using carbazole-derived phosphine ligands, with the crucial role of N-H moiety in promoting the catalytic reaction. The method was successfully applied in the Co/Ru-catalyzed hydroformylation process, resulting in the production of long-chain alcohols with excellent yields.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Theodor Danescu, Alexandru Lupan, Radu Silaghi-Dumitrescu, R. Bruce King
Summary: The structures and energies of complexes containing (Me2C2N2P)2Ru2(CO)n and (Me2C2N2P)2Fe2(CO)n have been studied. Low-energy structures are characterized by the presence of bridging diazaphospholyl rings, while higher-energy structures involve different ligand structures.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Savannah C. Kapper, Aamani Ponnekanti, Jonas Schaab, Tian-yi Li, Christine L. Chung, Gael Ung, Peter I. Djurovich, Mark E. Thompson
Summary: Organometallic iridium complexes with two cyclometalated ligands and one bis-oxazoline derived ancillary ligand were studied. These complexes have emission spanning across the visible and near-ultraviolet region, with moderate to high photoluminescence quantum yields. The (ppy)2Ir(BOX-CN) complexes were resolved into Delta- and Lambda-diastereomers based on solubility differences.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Zahra Karimi Sangari, Hossein Naeimi
Summary: In this research, a nanostructured CoCuFe2O4 catalyst was prepared using a brief and useful synthetic strategy. This catalyst was used for synthesizing 1,2,4,5-tetrasubstituted imidazole derivatives under ultrasonic irradiation. The approach offers advantages such as high efficiency, short reaction times, simplicity of the reaction medium, accelerated reaction rates, and easier separation and purification of products.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Rukhsana Gul, Wajid Munir, Ebraheem Abdu Musad Saleh, Shaukat Shujah, Muhammad Sirajuddin, Saira Tabassum, Khalil Ur Rehman, Dilfaraz Khan, Sameerah I. Al-Saeedi, Ehab A. Abdelrahman
Summary: Two new Schiff base ligands were synthesized and used to form copper, nickel, and cobalt complexes. The synthesized compounds were characterized and screened for various biological activities. The metal complexes showed better activities in antibacterial, antifungal, antidiabetic, and antioxidant assays.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Review
Chemistry, Inorganic & Nuclear
Ahsan Nazir, Pengwei Huo, Ameena Tur Rasool
Summary: This review explores the potential of g-C3N4-based S-scheme heterojunctions in addressing environmental issues. It summarizes the mechanism and preparation techniques of S-scheme heterojunctions based on g-C3N4, and presents recent studies on their applications in pollutant removal, CO2 reduction, hydrogen production, and bacterial disinfection. The review concludes with an outlook on future challenges for g-C3N4-based S-scheme heterojunctions.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Francois Mazars, Koffi Senam Etse, Guillermo Zaragoza, Lionel Delaude
Summary: The activity of three Pd-PEPPSI catalyst precursors with N-heterocyclic carbene (NHC) ligands derived from caffeine and theophylline in Mizoroki-Heck reactions was tested. The results showed that the catalysts achieved high conversions and yields, especially in the presence of electron-withdrawing substituents.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Bo-Han Wu, Xue Zhou, Lin Liu, Zheng-Bo Han
Summary: Researching carbon dioxide removal from flue gas and natural gas is crucial. Metal-organic frameworks (MOFs) are commonly used in adsorption due to their high surface area, porosity, and chemical properties. An ultra-microporous MOF CPM-20(Co) with mixed ligand was synthesized using inexpensive ligands. The material exhibited high selectivities and low regenerative energy, making it a promising option for CO2 separation in industries.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2024)